Cessna announced it was developing stretched version of the Citation II in 1987. This aircraft would be named the Citation V. The Citation V is based on the Citation II, but with Pratt & Whitney JT15D5A engines, a slight fuselage stretch of one and a half feet, and six inches more wing span. Fuel capacity was increased by 167 pounds. The Citation V Ultra was announced in September 1993. Compared with the Citation V, the Ultra features more powerful Pratt & Whitney JT15D5D engines with 145 pounds of additional thrust. The extra thrust allows a take off gross weight increase of 400 pounds, 39 nautical miles of increased range, and a 30-knot increase in normal cruise speed. The flight deck is equipped with the Honeywell Primus 1000 EFIS avionics suite.